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Despite the recent hiccup, the U.S. dollar, along with currency-related exchange traded funds, has strengthened this year and will continue appreciating against foreign currencies.

Over the past week, the PowerShares DB U.S. Dollar Index Bullish Fund (NYSEArca: UUP), which tracks the price movement of the U.S. dollar against a basket of currencies, including the euro, Japanese yen, British pound, Canadian dollar, Swedish krona and Swiss franc, has gained 1.8%. Additionally, the actively managed WisdomTree Bloomberg U.S. Dollar Bullish Fund (NYSEArca: USDU), which tracks the USD against a broader basket of developed and emerging market currencies, also rose 1.8%. Year-to-date, UUP returned 6.4% and USDU increased 4.8%. [Recent Weakness in Dollar ETFs Only a Minor Setback]

Meanwhile, the PowerShares DB US Dollar Index Bearish Fund (NYSEArca: UDN), which takes the inverse or short performance of the U.S. dollar against the same basket of six major currencies as UUP, dipped 1.7% over the past week and declined 8.3% year-to-date.

Kathy Lien, a foreign exchange strategist and managing director of BK Asset Management, argues that the bullish cycle in the U.S. dollar is only getting started, so traders should not try to bet against the greenback, reports Amanda Diaz for CNBC.

“I think that the Fed tightening story is the main one that is going to continue to drive the dollar,” Lien added. “At the end of the day, data is improving and the language from the Federal Reserve is very consistent. They are going to raise interest rates. So I do think the greenback moves higher.”